* {
    margin: 0;
    padding: 0;
}

body {
    background-color: rgb(242, 245, 248);
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

.header {
    margin: 20px auto;
    width: 1200px;
    height: 42px;
    /*background-color: lightblue;*/
}

.log {
    float: left;
    margin-right: 80px;
    height: 42px;
    text-align: center;
}

.nav li {
    float: left;
    margin-left: 30px;
    height: 42px;
    line-height: 42px;
    perspective: 400px;
}

.nav li .box {
    position: relative;
    width: 120px;
    height: 35px;
    transform-style: preserve-3d;
    transition: all .4s;
}

.nav li .box .front,
.nav li .box .bottom {
    position: absolute;
    top: 0;
    left: 0;
    color: #fff;
    font-size: medium;
    width: 90px;
    height: 35px;
    text-align: center;
    line-height: 35px;
}

.nav li .box .front {
    background-color: rgb(136, 222, 255);
    z-index: 1;
    transform: translateZ(17.5px);
}

.nav li .box .bottom {
    background-color: powderblue;
    transform: translateY(17.5px) rotateX(-90deg);
}

.nav ul li .box:hover {
    transform: rotateX(90deg);
    cursor: pointer;
}

.nav li a {
    color: black;
}

.nav li a:hover {
    color: rgb(0, 152, 255);
    border-bottom: 2px solid #00a4ff;
}

.search {
    float: left;
    height: 42px;
    line-height: 42px;
}

.search input {
    float: left;
    margin-left: 60px;
    padding-left: 15px;
    width: 249px;
    height: 40px;
    outline: none;
    border: 1px solid rgb(0, 152, 255);
    border-right: 0;
    color: rgb(221, 223, 225);
}

.search .btn {
    float: left;
    width: 50px;
    height: 42px;
    outline: none;
    background-image: url("imgs/btn.png");
    border: 0;
}

.user {
    float: right;
    height: 42px;
    line-height: 42px;
}

.user img {
    vertical-align: middle;
}

.user h3 {
    position: relative;
    display: inline;
    font-weight: 400;
    padding-right: 30px;
}

.user .useset {
    position: absolute;
    width: 80px;
    top: 35px;
    left: 5px;
    background-color: #00a4ff;
    display: none;
}

.user .useset li {
    position: relative;
    text-align: center;
    height: 40px;
    line-height: 40px;
}

.user .useset li div {
    position: absolute;
    width: 0;
    height: 0;
    border: 10px solid transparent;
    border-bottom-color: #00a4ff;
    top: -20px;
    right: 5px;
}

.banner {
    height: 421px;
    background-color: #1c036c;
    /*background: url("imgs/banner.png") no-repeat top center;*/
}

.banner .w {
    margin: auto;
    width: 1200px;
    height: 421px;
    background: url("imgs/banner.png") no-repeat top center;
    /*background-color: lightblue;*/
}

.subnav ul {
    float: left;
    width: 180px;
    height: 421px;
    background-color: rgba(0, 0, 0, .3);
}

.subnav li {
    height: 46px;
    line-height: 46px;
    padding: 0 20px;
}

.subnav a {
    position: relative;
    display: inline-block;
    width: 100%;
    height: 100%;
    font-size: 14px;
    color: #ffffff;
}

.subnav a::after {
    content: "";
    position: absolute;
    top: 50%;
    margin-top: -7px;
    right: 8px;
    width: 8px;
    height: 8px;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg);
    transition: all .3s;
}


/* .subnav span {
    float: right;
} */

.subnav a:hover {
    color: rgb(0, 152, 255);
}

.subnav a:hover::after {
    transform: rotate(45deg);
    border-right: 2px solid rgb(0, 152, 255);
    border-bottom: 2px solid rgb(0, 152, 255);
}

.banner .pic {
    float: left;
    position: relative;
    width: 790px;
    height: 421px;
    /* background-color: bisque; */
}

.pic .prv,
.pic .dev {
    position: absolute;
    top: 50%;
    margin-top: -20px;
    font-weight: 700;
    color: rgb(255, 255, 255);
    font-size: larger;
    background-color: rgba(247, 241, 241, 0.3);
    border-radius: 40%;
}

.pic .prv {
    right: 30px;
}

.pic .dev {
    left: 30px;
}

.pic ul {
    position: absolute;
    width: 70px;
    height: 13px;
    /* background-color: #fff; */
    background: rgba(255, 255, 255, .3);
    border-radius: 7px;
    bottom: 15px;
    left: 50%;
    margin-left: -35px;
}

.pic ul li {
    float: left;
    width: 8px;
    height: 8px;
    margin: 3px;
    border-radius: 50%;
    background-color: white;
}

.pic ul li .first {
    background-color: orange;
}

.w .course {
    float: right;
    margin-top: 50px;
    width: 230px;
    height: 350px;
}

.course h3 {
    height: 48px;
    line-height: 48px;
    text-align: center;
    background-color: rgb(149, 202, 235);
    color: white;
}

.bd {
    padding: 0 20px;
    background-color: #eeeeee;
}

.course li {
    padding: 10px 0;
    border-bottom: 1px solid #5555;
}

.bd p {
    color: #788;
    font-size: 14px;
}

.bd button {
    margin-top: 5px;
    margin-bottom: 5px;
    font-weight: 700;
    width: 190px;
    height: 38px;
    border: 1px solid #00a4ff;
    color: #00a4ff;
}

.subban {
    margin: 10px auto;
    padding: 0 20px;
    width: 1160px;
    height: 60px;
    line-height: 60px;
    background-color: #fff;
    box-shadow: 0 2px 3px 3px rgba(0, 0, 0, .1);
}

.subban .title,
.subl li {
    float: left;
}

.subban .title {
    /*margin-right: 50px;*/
    color: #00a4ff;
}

.subl li {
    font-size: 14px;
}

.subl li span {
    padding: 0 40px;
    color: #5555;
}

.subban .lianj {
    float: right;
}

.subban .lianj a {
    font-size: 14px;
    color: #00a4ff;
}

.jingpintj {
    margin: 0 auto;
    width: 1200px;
    overflow: hidden;
}

.tuij {
    height: 60px;
    line-height: 60px;
}

.jingpintj a {
    float: right;
    padding-right: 20px;
    font-size: 12px;
    color: dimgray;
}

.tuij h4 {
    float: left;
    color: grey;
    font-size: 16px;
}

.lieb ul li {
    float: left;
    position: relative;
    margin-right: 12px;
    margin-bottom: 10px;
    width: 228px;
    height: 270px;
    background-color: white;
    overflow: hidden;
}

.lieb li em {
    position: absolute;
    top: 4px;
    right: -4px;
    z-index: 1;
}

.lieb ul li a {
    float: left;
}

.lieb ul li h3 {
    margin: auto;
    width: 0;
    height: 40px;
    line-height: 40px;
    font-size: 15px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    animation: step 3s steps(10) forwards infinite;
    /* animation-play-state: ; */
}

@keyframes step {
    0% {
        width: 0;
    }
    100% {
        width: 150px;
    }
}

.lieb ul li:hover {
    box-shadow: 0 2px 10px 3px rgba(0, 0, 0, .3);
}

.lieb ul li:hover a>img {
    transform: scale(1.1)
}

.lieb ul li a>img {
    width: 228px;
    height: 230px;
    transition: all .4s;
}


/* .lieb ul li a>img:hover {
    filter: blur(1px);
} */

.footer {
    /* margin-top: 20px; */
    height: 300px;
    background-color: white;
}

.footer .w {
    margin: auto;
    padding-top: 30px;
    width: 1200px;
}

.footer .left {
    float: left;
    width: 500px;
    margin-right: 140px;
}

.footer p {
    padding: 10px 0;
    color: grey;
    font-size: 14px;
    text-indent: 1em;
}

.footer button {
    width: 100px;
    height: 35px;
    color: #00a4ff;
    background-color: white;
    border: 2px solid #00a4ff;
}

.footer dl {
    float: left;
    margin-right: 130px;
    font-size: 14px;
    color: dimgrey;
}


/*.footer dl .last {*/


/*    margin-right: 20px;*/


/*}*/

.footer dt {
    padding-bottom: 10px;
    font-weight: 700;
}

.fix {
    position: fixed;
    bottom: 0;
    right: 0;
    z-index: 2;
}

.fix img {
    transition: all .3s;
    transform-origin: center;
}

.fix:hover img {
    transform: rotate(360deg);
}

.sing {
    overflow: hidden;
    width: 1180px;
    height: 330px;
    margin: auto;
    padding: 15px 10px;
    background-color: #fff;
}

.sing p {
    text-indent: 2em;
    line-height: 43px;
    font-size: 17px;
    font-family: "Arial Normal";
}

.sing div {
    float: left;
    width: 300px;
    height: 300px;
    margin-right: 15px;
    overflow: hidden;
    background: url(imgs/sing.jpg) no-repeat center center;
}

.sing div::before {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .3);
    transform: rotate(180deg);
    transform-origin: left bottom;
    transition: all .3s;
}

.sing div:hover::before {
    transform: rotate(360deg);
}

.page {
    width: 1200px;
    height: 44px;
    margin: auto;
    padding-left: 750px;
    box-sizing: border-box;
}

.page li {
    float: left;
    width: 32px;
    height: 32px;
    line-height: 32px;
    text-align: center;
    margin: 5px;
    background-color: rgb(221, 220, 220);
    border: 1px solid #000;
    border-radius: 50%;
    transition: all .3s;
}

.page li:hover {
    transform: scale(1.2);
    cursor: pointer;
}